Richard Hanrahan Dam is an earth dam located in Madison County, Iowa, built in 2018. It carries a Low hazard potential classification.
Dam profile
NID height · 29 ft29 ft tall and 280 ft long, taller than 65% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Richard Hanrahan Dam
The primary purpose of Richard Hanrahan Dam is grade stabilization. Grade stabilization dams prevent erosion by reducing the slope and velocity of water flowing through a channel. They're commonly used to stop gullies from deepening and to protect downstream land and infrastructure. The dam is owned by Richard Hanrahan (private). It impounds the Trib to Badger Creek near Carlisle.
The dam stands 29 feet tall and stretches 280 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 30 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2018, the structure is relatively new.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Iowa |
| County | Madison |
| Nearest City | Carlisle |
| River/Stream | Trib to Badger Creek |
| Coordinates | 41.43330, -93.81750 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 280 ft |
| Year Completed | 2018 (8 years old) |
Storage & Hydraulics
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Normal Storage | 6 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 456 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Richard Hanrahan |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04307 |
| Federal ID | IA04307 |
| More Info | State Dam Safety Program |